Chaotic mixing performance and mass transfer enhanced by rigid-flexible impeller with pulse jet

Zuohua LIU; Wei SUN; Xia XIONG; Changyuan TAO; Yundong WANG; Fangqin CHENG

doi:10.11949/0438-1157.20200303

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Chaotic mixing performance and mass transfer enhanced by rigid-flexible impeller with pulse jet

Fluid dynamics and transport phenomena | 更新时间：2025-11-25

- Chaotic mixing performance and mass transfer enhanced by rigid-flexible impeller with pulse jet
- CIESC Journal Vol. 71, Issue 10, Pages: 4632-4641(2020)
- 作者机构：
  
  1.重庆大学化学化工学院，重庆 400044
  2.清华大学化学工程系，北京 100084
  3.煤矿灾害动力学与控制国家重点实验室，重庆大学，重庆 400044
  4.山西大学资源与环境工程研究所，山西太原 030006
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20200303
  CLC： TQ 028.8
- Received：23 March 2020，
  
  Revised：2020-07-10，
  
  Published：05 October 2020
- 稿件说明：
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刘作华, 孙伟, 熊黠, 陶长元, 王运东, 程芳琴. 脉冲射流-刚柔组合桨强化流体混沌混合及传质性能研究[J]. 化工学报, 2020, 71(10): 4632-4641

LIU Zuohua, SUN Wei, XIONG Xia, TAO Changyuan, WANG Yundong, CHENG Fangqin. Chaotic mixing performance and mass transfer enhanced by rigid-flexible impeller with pulse jet[J]. CIESC Journal, 2020, 71(10): 4632-4641
刘作华, 孙伟, 熊黠, 陶长元, 王运东, 程芳琴. 脉冲射流-刚柔组合桨强化流体混沌混合及传质性能研究[J]. 化工学报, 2020, 71(10): 4632-4641 DOI： 10.11949/0438-1157.20200303.

LIU Zuohua, SUN Wei, XIONG Xia, TAO Changyuan, WANG Yundong, CHENG Fangqin. Chaotic mixing performance and mass transfer enhanced by rigid-flexible impeller with pulse jet[J]. CIESC Journal, 2020, 71(10): 4632-4641 DOI： 10.11949/0438-1157.20200303.

摘要

传统搅拌反应器普遍使用刚性桨进行机械搅拌，导致反应器内容易产生混合隔离区而降低流体混合效率。采用多流场耦合诱发混沌现象，促使更多流体进入混沌状态，是提高流体混合效率的有效途径之一。结合Matlab软件编译PJ-RF-RT体系中的压力脉动信号得到最大Lyapunov指数（LLE）与多尺度熵（MSE），探究不同脉冲周期下占空比、桨型、柔性桨叶厚度、桨离底高度及脉冲空气射流量对搅拌反应器内流体混沌混合的影响，同时，对比分析了桨型、射流类型、气流量对体积氧传质系数

的影响。研究结果表明，在脉冲周期

=0.4 s，占空比

=80%时，RF-RT桨体系较R-RT桨体系的LLE增大了11.58%，且RF-RT体系的MSE显著高于R-RT桨体系，表明脉冲射流刚柔组合桨体系能更好地诱发流体混沌，增大流体混合效率，均化体系能量分布。此外，脉冲射流耦合RF-RT桨体系增强了流体的湍流特性，促使液膜厚度减小，强化了传质，在单位体积功耗

=360 W/m

时，PJ-RF-RT体系的

较PJ-R-RT提高了13.46%，PJ-R-RT体系的

较SJ-R-RT提高了11.86%。

Abstract

Conventional stirred reactors generally use rigid impeller for mechanical stirring

which leads to the easy creation of isolation mixing regions in the reactor and reduces the efficiency of fluid mixing. The use of multi-flow field coupling to induce chaos and promote more fluids into a chaotic state is one of the effective ways to improve fluid mixing efficiency. In this work

the largest Lyapunov exponent(LLE) and multi-scale entropy(MSE) are investigated with the Matlab compile pressure pulsation signals. The effects of duty ratio

paddle type

flexible paddle thickness

paddle height from the bottom and pulsed air jet flow rate on the chaotic mixing of fluids in a stirred reactor under different pulse periods are explored. In addition

the effects of different impeller types

jet types and air jet flow rate on the volume oxygen mass transfer coefficient

are compared and analyzed. When

=0.4 s and

=80%

the results show that the LLE of the rigid-flexible RT impeller compared with the rigid RT impeller increases 11.58% and the MSE of the rigid-flexible RT impeller is also larger than that of rigid RT impeller. It was showed that the pulsed jet rigid-flexible impeller system can better enhance fluid chaos

increase the fluid mixing efficiency and homogenize the system energy distribution. In addition

pulse jet coupling RF-RT impeller system enhances the turbulent characteristics of the fluid

promotes the reduction of the thickness of the liquid film

strengthens the mass transfer and increases the

value of the system. When power consumption per unit volume is 360 W/m

the

of the PJ-RF-RT system compared with the PT-R-RT system increases 13.46%

and the

of the PJ-R-RT system compared with the SJ-R-RT system increases 11.86%.

关键词

Keywords

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